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Is there a interphase in meiosis?

2007-01-25 12:14:07 · 7 answers · asked by ? 2 in Science & Mathematics Biology

7 answers

There is an interphase, but interphase is not a part of either mitosis or meiosis.

Meiosis starts with Prophase I, just as mitosis starts with prophase.

Interphase IS the first stage of the CELL CYCLE (interphase, mitosis, cytokinesis or interphase, meiosis I, cytokinesis, meiosis II, cytokinesis).

2007-01-25 12:32:00 · answer #1 · answered by ecolink 7 · 1 0

Meiosis

Prophase

The first stage of Prophase I is the leptotene stage, during which individual chromosomes begin to condense into long strands within the nucleus.

The zygotene stage then occurs as the chromosomes approximately line up with each other into homologous chromosomes. The combined homologous chromosomes are said to be bivalent. They may also be referred to as a tetrad, a reference to the four sister chromatids. During this stage, one percent of DNA that wasn't replicated during S phase is replicated. The significance of this cleanup act is unclear.

The pachytene stage heralds crossing over. Nonsister chromatids of homologous chromosomes randomly exchange segments of genetic information. Because the chromosomes cannot be distinguished in the synaptonemal complex, the actual act of crossing over is not perceivable through the microscope.

During the diplotene stage, the synaptonemal complex degrades. Homologous chromosomes fall apart and begin to repel each other. The chromosomes themselves uncoil a bit, allowing some transcription of DNA. They are held together by virtue of recombination nodules, betraying the sites of previous crossing over, the chiasmata.

Chromosomes recondense during the diakinesis stage. Sites of crossing over entangle together, effectively overlapping, making chiasma clearly visible. In general, every chromosome will have crossed over at least once. This means that the pairs of homologous chromosomes are so tightly packed they exchange genetic material. The nucleoli disappears and the nuclear membrane disintegrates into vesicles.

During these stages, centrioles are migrating to the two poles of the cell. These centrioles, which were duplicated during interphase, function as microtubule coordinating centers. Centrioles sprout microtubules, essentially cellular ropes and poles, during crossing over. They invade the nuclear membrane after it disintegrates, attaching to the chromosomes at the kinetochore. The kinetochore functions as a motor, pulling the chromosome along the attached microtubule toward the originating centriole, like a train on a track. There are two kinetochores on each tetrad, one for each centrosome. Prophase I is the longest phase in meiosis.

Microtubules that attach to the kinetochores are known as kinetochore microtubules. Other microtubules will interact with microtubules from the opposite centriole. These are called nonkinetochore microtubules.

And I do not know of any interphase in meiosis according to my knowledge and internet findings.

2007-01-25 12:34:36 · answer #2 · answered by Anonymous · 0 0

Interphase has 3 parts to it called G1 S and G2 phase G stands for growth

2007-01-25 12:21:07 · answer #3 · answered by ErinMarie 2 · 0 1

in meiosis , prophase 1 is the 1st step

2007-01-25 12:24:39 · answer #4 · answered by igriffin2 2 · 1 0

It's either a boy or a girl. Possibly Twins!

2016-05-24 00:08:12 · answer #5 · answered by ? 4 · 0 0

Prophase, Metaphase, anaphase then telophase.

2007-01-25 12:32:37 · answer #6 · answered by Anonymous · 0 1

check out cellsalive.com for some animations

2007-01-25 19:09:41 · answer #7 · answered by Anonymous · 0 0

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